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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
12.1k
Companies
579
Updated
10.10.2026
12.1k Questions 579 Companies10.10.2026
PLTCHK testimonial
PLTCHK

"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"

_The_TaNk_ testimonial
_The_TaNk_

"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"

Chris testimonial
ChrisSenior SWE, LinkedIn

"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."

sleepy33 testimonial
sleepy33

"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."

Jake testimonial
JakeSenior ML Engineer, Lyft

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

nuggetlord testimonial
nuggetlord

"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
boba.tea.vibes

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

Andy testimonial
AndySWE-II, Google

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

couchpotato99 testimonial
couchpotato99

"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."

Shruti testimonial
ShrutiData Engineer, Salesforce

"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."

midnightramen testimonial
midnightramen

"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."

Bianca testimonial
BiancaFrontend Eng, Figma

"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."

tambrahm007 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
toa

"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."

PLTCHK testimonial
PLTCHK

"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"

_The_TaNk_ testimonial
_The_TaNk_

"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"

Chris testimonial
ChrisSenior SWE, LinkedIn

"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."

sleepy33 testimonial
sleepy33

"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."

Jake testimonial
JakeSenior ML Engineer, Lyft

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

nuggetlord testimonial
nuggetlord

"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
boba.tea.vibes

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

Andy testimonial
AndySWE-II, Google

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

couchpotato99 testimonial
couchpotato99

"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."

Shruti testimonial
ShrutiData Engineer, Salesforce

"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."

midnightramen testimonial
midnightramen

"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."

Bianca testimonial
BiancaFrontend Eng, Figma

"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."

tambrahm007 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
toa

"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."

Showing 20 results
Amazon logo
Amazon
Medium
Machine Learning Engineer

Design an LLM Chatbot: Training Data, Reward Design and Deployment Considerations

Design a chatbot built on a large language model. Walk through the whole lifecycle, and explain three areas in depth: how you would build the training...

ML System DesignFine-Tuning & Alignment TechniquesReinforcement Learning
1
0
10 people solved
Jan 3, 2026
Roblox logo
Roblox
Medium
Data Scientist

Evaluate Impact of New Roblox Homepage Tab

Evaluate the Impact of a New Roblox Homepage Tab Roblox plans to replace an existing homepage tab with a new one. The team needs to measure whether th...

Analytics & ExperimentationExperiment Design (A/B Testing)Metrics & KPIs
54
0
166 people solved
Jul 12, 2025
Amazon logo
Amazon
Hard
Software Engineer Locked

Explain Aurora-style internals: WAL, MVCC, replication, recovery

This question evaluates knowledge of database storage engine and distributed database internals, covering write-ahead logging, MVCC, replication model...

Software Engineering Fundamentals
6
0
62 people solved
Jan 22, 2026
Meta logo
Meta
Medium
Software Engineer AI

Maximum Length of a Word Selection With All Unique Characters

You are given an array of lowercase strings words. Select a subset of these words (zero or more, chosen in any order) and concatenate them. The select...

Coding & Algorithms
2
0
26 people solved
Mar 6, 2026
Uber logo
Uber
Medium
Machine Learning Engineer Locked

Implement Multi-Head Self-Attention

This question evaluates understanding of multi-head self-attention and the competency to implement transformer attention modules using learned Q/K/V p...

Machine LearningML CodingTransformers & Attention
19
0
133 people solved
Jan 10, 2026
Coinbase logo
Coinbase
Medium
Software Engineer

Generate constrained NFT metadata

Generate constrained NFT metadata Given a set of trait types (e.g., background, eyes, hat), each with a list of allowed values, and a target count N, ...

Coding & AlgorithmsBacktracking & Recursion
18
0
141 people solved
Jul 26, 2025
DoorDash logo
DoorDash
Medium
Software Engineer

Compute nearest dashmart distances for queries

You are given an m x n grid where each cell is one of: -1 for a wall (impassable), 0 for a dashmart (a store), and INF = 2^31 - 1 for an empty room. M...

Coding & AlgorithmsGrids & MatricesGraphs
14
0
129 people solved
Sep 6, 2025
ByteDance logo
ByteDance
Medium
Machine Learning Engineer Locked

Reverse a Linked List in Groups of K

Implement reverse_k_group(values, k) for a singly linked list represented by the array values in traversal order. Work through the function contract, ...

Coding & Algorithms
2
0
16 people solved
Jul 24, 2026
Meta logo
Meta
Easy
Machine Learning EngineerSenior+ Locked

Design an Online Coding Judge

This question evaluates system design and scalability skills for building a high-throughput, low-latency online coding judge, covering distributed arc...

System Design
3
0
64 people solved
Feb 27, 2026
Airbnb logo
Airbnb
Medium
Data Scientist Locked

Build and evaluate an order prediction model

This question evaluates a data scientist's competency in building and evaluating binary classification models with temporal constraints and operationa...

Machine LearningSupervised LearningModel Evaluation
10
0
103 people solved
Oct 13, 2025
Two Sigma logo
Two Sigma
Medium
Data Scientist Locked

Return sorted values after quadratic transform

This question evaluates understanding of mathematical transformations and array manipulation, specifically how applying a quadratic function affects t...

Coding & AlgorithmsTwo Pointers & Sliding WindowArrays & Strings
7
0
92 people solved
Jan 22, 2026
Amazon logo
Amazon
Medium
Software Engineer

Find returning users from access logs

Given a large user access log, parse it and identify which user_ids are returning customers—i.e., they have at least one visit on two or more distinct...

Data Manipulation (SQL/Python)
3
0
31 people solved
Sep 6, 2025
Google logo
Google
Medium
Data ScientistIntern Locked

Generate Uniform Samples and Estimate Percentiles

Solve two Google statistics questions: sample uniformly from a square using rand01 and estimate percentiles from histogram buckets using cumulative co...

Statistics & Math
9
0
80 people solved
Mar 27, 2025
Google logo
Google
Hard
Software Engineer Locked

Compute distance-sum from every tree node

This question evaluates understanding of tree and graph algorithms, including computation of pairwise distances and techniques for aggregating path le...

Coding & AlgorithmsTreesDynamic Programming
26
0
192 people solved
Jan 22, 2026
Thumbtack logo
Thumbtack
Medium
Data Scientist

Compute weekly 3-week rolling sums in SQL

Using PostgreSQL, write a single query that outputs, for each calendar week in a given range, the sum of amounts in that week and a rolling sum over t...

Data Manipulation (SQL/Python)
1
0
23 people solved
Oct 13, 2025
PayPal logo
PayPal
Hard
Data Scientist

Detect credit-card transaction fraud

Credit-Card Fraud Detection: Real-Time Decisioning and System Design You are designing a real-time decisioning system for card-payment authorizations ...

ML System DesignModel EvaluationUnsupervised Learning
20
0
227 people solved
Aug 4, 2025
Uber logo
Uber
Medium
Software Engineer

Build a QuadTree From a Grid

Implement a compressed QuadTree for a square grid. You are given an n x n grid of values, where n is a power of two. The values are not limited to bin...

Coding & Algorithms
2
0
17 people solved
Apr 18, 2026
ByteDance logo
ByteDance
Medium
Software Engineer Locked

Solve String Addition and Expression Evaluation

This question evaluates string manipulation and parsing skills for numeric computation, covering addition of integers represented as character arrays ...

Coding & Algorithms
7
0
54 people solved
Apr 16, 2026
Spotify logo
Spotify
Medium
Machine Learning Engineer

Join Tables and Rank Users

You are given two analytics tables: - users(user_id, country, signup_date) - listening_events(event_id, user_id, played_at, minutes_played) Because th...

Coding & AlgorithmsSQLIndexing & Query Performance
13
0
128 people solved
Mar 4, 2026
Roblox logo
Roblox
Medium
Data Scientist

Write SQL to flag suspect payments and chargebacks

Assume today is 2025-09-01. Using only CASE WHEN and JOINs (no window functions required), write a single SQL query that produces, for each user with ...

Data Manipulation (SQL/Python)
1
0
25 people solved
Oct 13, 2025
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